Last updated 24 March 2024


Part Four

Series Episode Number: 606

World Premiere: Fri 13 Jan 1984 - 6:40pm GMT [BBC One] (United Kingdom)
First Broadcast: Mon 11 May 2015 - 8:30pm EDT [Retro TV]
Running Time: 24 minutes 48 seconds

6.60 Million (UK)

Appreciation Index: 65 (UK)

Chart Position: 87 () (UK)




Lethal hexachromite gas is used against the reptilian threat. World war is avoided but many lives are lost and the Doctor reflects there should have been another way.


Production Team hide uncredited
WriterJohnny Byrne
DirectorPennant Roberts
ProducerJohn Nathan-Turner
DesignerTony Burrough
Script EditorEric Saward
Title SequenceSid Sutton
Costume DesignerJudy Pepperdine
Make-up ArtistJennifer Hughes
LightingPeter Smee
SoundMartin Ridout
Vision MixerNigel Finnis
Videotape EditorHugh Parson
Technical ManagerAlan Arbuthnott
Camera SupervisorBob Baxter
Camera SupervisorAlec Wheal
Visual Effects DesignerMat Irvine
Video EffectsDave Chapman
Production ManagerMichael Darbon
Production AssociateJune Collins
Production AssistantNorma Flint
Assistant Floor ManagerAdrian Hayward
Incidental MusicJonathan Gibbs
Special SoundDick Mills
Title Music BBC Radiophonic Workshop
Special Sound BBC Radiophonic Workshop
Title MusicRon Grainer (uncredited)
Title Music ArrangerPeter Howell (uncredited)
Floor AssistantSarah Woodside (uncredited)
Visual Effects AssistantStuart Murdoch (uncredited)
Computer GraphicsJohn Mitchell (uncredited)
Design AssistantMichael Trevor (uncredited)
Show Working SupervisorLes Runham (uncredited)
Show Working SupervisorJay Stinton (uncredited)
Senior Studio EngineerRon Frith (uncredited)
Senior Studio EngineerIan McLeod (uncredited)
Props BuyerRoger Wood (uncredited)
Lighting ChargehandGeoff Allen (uncredited)
Lighting ChargehandDennis Leach (uncredited)
DresserRichard Bateman (uncredited)
DresserAlan Brewer (uncredited)
DresserCamilla Gavin (uncredited)
DresserStephen George (uncredited)
DresserRon Simpson (uncredited)
DresserNeil Sweetmore (uncredited)
Artist BookingSarah Bird (uncredited)